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' @engagierte Letters Patent No. 80,742,61ated August 4, 186B..

` IMPROVEMENT Insetti-:Ws i

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TO ALL `WHOM IT'MAYICONQERN Be it known that I, I. N. JACOBUS, of FlatBrookville, in thecounty of Sussex, and State of New Jersey, have'invented e new and useful Improvement in Screws and Screw-Drivers; andI (lo hereby 4declare that the following-is a full, clear, and exactdescription'thereoi, which will enable those skilledin theart-ito makeand @rse the same, reference being had to the accompanying` drawings,forming part of this-specification. Y

This invention vrelates to certain iinprovements'in screws, and itlconsists in providing the head of the sere vith two or more triangularnotches, extending through-it,V and slightly dvetailed.

The object in providing the head of the screw `with these notchesis toadapt the same to be 'grasped by n screw-driver of peculiarconstruction, for which -Iam about to mehr application for Lett-ersPatent.

In the accompanying drawings- 4 I Figure 1 isa perspective lview i' ascrew, showing my improvement in the head.

. Figur? 2 is-a top view of the sanne. i

Similar letters of reference indicate corresponding parts. p l

A represents a. screw, the body of which is .of ordinary construction! ais the head, cut out at equal distonces upon the edge, to form a:seriesrof triangularsnotches, b, slightly lovetaile'd, and extending`entirely through the head, longitudine-ily of the screw.

In figl is shown, in red, one jaw of a screw-driver 'adapted foruse withmy improved screw. .It is necessary that the number of these jaws shouldcorrespond with thc number of notches in the screw. l I find it-mostconvenient to employ three.4 The ends of the jaws aretbcvelled in such avmanner that, when tted in the notches 6, they conformto the shape ofthe screw-head upon the under side, wherebytlie screw can be set intothe wood, and'its head countersunk, without removing the jaws.

lIt is not designed to form a hole in the wood to which the screw is tobe applied previous to the introduction ofthe screw, but Vthe latter,after being grasped bythe screw-driver, held in au ordinary bit-stock,is

screweddircctly into the wood. l I

The advantages of this construction of the-screw, taken inconncetionwith the-scrcw-drivcr, are appa-rent, and do not requirefurther-'explanation n l y. i Having thus describedliny invention, whatI claim ns new, and desire to secure Letters Patent, is-'- i The screwA, having its head provideclwith the'triangulur notcheslw, 'extendingentirely through the same,

longturlinallyof the scremnnd adapted toy receive the jaws ofthescrewdriver in such a manner thatjsa'id l jaws shell complete theb'evelled circumference of thcheod, as herein described, for the purposespecified.

.r N. Moores.

Witnesses:

MARTIN HULL, Jenn S. Smm.

